Cloud 9 Charleston 9 is rated 2.5 TOG at 9 mm. Whether it works over underfloor heating and which carpets it pairs with under the 2.5 TOG limit.

Updated 05 September 2026.

Underlay TOG rating

Cloud 9 Charleston 9 TOG rating and underfloor heating

The published TOG and datasheet figures for Cloud 9 Charleston 9, and what it means over a heated floor.

1.52.5
2.5TOG
Too warm for UFH

Already 0 TOG over the 2.5 TOG limit on its own, before any carpet is added.

PassMarginalFail
Cloud 9 Charleston 9 is rated 2.5 TOG. That alone is above the 2.5 TOG combined limit for underfloor heating, so it is not suitable over a heated floor with any carpet.
Published datasheet
ManufacturerBall & Young
TOG rating2.5 TOG
Thickness9 mm
Density156 kg/m3
Sound39 dB impact reduction
Underfloor heatingNot suitable

Charleston 9 is a 9 mm premium PU foam underlay rated 2.5 TOG. That resistance matches the whole combined limit on its own, so it is a luxury-feel underlay for rooms without underfloor heating.

Because Cloud 9 Charleston 9 is already 2.5 TOG before any carpet is added, no carpet brings the pair back under the 2.5 TOG limit. Over underfloor heating, swap it for a low-TOG underlay instead.

TOG measures thermal resistance, so a low number means heat passes through easily. For a floor covering over underfloor heating that is what you want. A comfort underlay chosen for warmth underfoot does the opposite job and is the usual reason a heated floor underperforms after a carpet goes down.

Pairings and alternatives
Cormar Pimlico with Cloud 9 Charleston 9combined 2.5 TOGCormar Primo Textures Ribbed with Cloud 9 Charleston 9combined 2.5 TOGCormar Primo Textures Weave with Cloud 9 Charleston 9combined 2.4 TOGCormar Apollo Plus with Cloud 9 Charleston 9combined 2.6 TOGCormar Apollo Elite with Cloud 9 Charleston 9combined 3 TOGCormar Fairisle with Cloud 9 Charleston 9combined 3 TOG

Questions and answers

What is the manufacturer of the Cloud 9 Charleston 9 TOG rating and underfloor heating?

Ball & Young

What is the tog rating of the Cloud 9 Charleston 9 TOG rating and underfloor heating?

2.5 TOG

What is the thickness of the Cloud 9 Charleston 9 TOG rating and underfloor heating?

9 mm

What is the density of the Cloud 9 Charleston 9 TOG rating and underfloor heating?

156 kg/m3